Mechanical movement



J. KROHN. MECHANICAL MOVEMENT. 1 APPLICATION FILED APR. 26, I920.

Patented Oct. 4, 1921..

2 SHEETS-SHEET I- I. KIIOHN.

MECHANICAL MOVEMENT. APPLICATION FILED APQR. 26, I920. 7 1,392,508, I Patented Oct; 4, 192 1.

2 SHEETS-SHEET-Z.

, tion.

, which is mounted an eccentrically gyr'ating gear wheel carried by the of the United States, ark, in the county Jersey, have invented certain new and usemechanical movements, larly to combination-of mechanical elements incorporated in UNITED 'STATEQSTPATENVIT 7 oFFiCE.

MECHANICALYMOVEMENI.1 I -.i1 y

- Application filed April 26,

T 0 all whom it my concern: p

Be it known that 1, JOHN KROH-N, a citizen ofEssex-and State of New Mechanical 7 Moveful Improvements in specificaments, of which the following is a This invention relates to improvements in the driving mechan sm of motor vehicles, and especially in the speed reducing gearing thereof. ,The mechanical; movement embodying the invention is herein illustrated and described as forming apart of that type of speed'reducing mechanism comprising in general a driving s hajft,'or iv gear wheel vwhich meshes withgan internal driven shaft, the a so-called eccentric gear wheel being of 7 smaller pitch diameter and of a less number,

of teeth transmitted to than the internal gear wheel, so that as the'driving shaft is rotated, power is the driven shaft in the form of a rotative movement at a reduced speed in the .inverseTatio of a the gear wheels.

- associated with ticularly where to be understood'that ment This invention pertains to the mechanism the eccentrically rotating gear wheel, and has for its purpose the counter-balancing of this member in order to overcome the unequal distributionof the i 1 weight of the rotating parts with respect to the common axis of rotation, and to thereby eliminate excessive wear, vibration or other undesired results that; may develop, -par-,

the parts are rotated at a high speed. 7 v

The transmission mechanism herein .described. and illustrated is more especially de-, signed as a part ofthe driving mechanism of an electric driven vehicle, although it is the same may be applied in any mechanism adapted for trans-Q initting power and involving the reduction of speed. The mechanism hereinafter described has referenceto the accompanying;

drawings, in 'wh1ch-- Figure 1 1s aview in longitudinal section driving an driven shafts, the differential mechanism associated therewith, andthe speed-reducing] gearing embodying the mechanical moveof the invention, w

rig. 2 is and aresident of Newand more particurear axle of the vehicle, arranged concentrically with respect to' the V drivin i embers,

speed the number of teeth of through hand I end J of the d 7' extending throughout the driving shaft, and

ings 8 or NEWABK, NEW 1m I; v

ratentea oea 4 1921 1926. Serial 376,553, w

line 2-2 of Fig. 1, and a Fig. 3 is. a perspective view of the rotative sleeve provided with the eccentric bearing surfaces and the counter-weight;

v g to the mechanism and the parts associated with th'e mechanical Referring in general movement involved, a; casing 1, generally cylindric in; shape, is supported upona suitable supporting member,.as for instance, the

shaft-2, which may be also termed and the driven, shafts the driving 'member,

be termed the driven nating within the casing,

2- and the driven tween the driving shaft shafts 3-3 is the usual form of differential located atthe left gearing,the same being hand ,end of the casing 1, as shown 'in'fFig. and inclosed within that portion thereof,

surrounded by the. tapered wall port on4. This, differential mechanism serves 1 the usual a cross sectional view takenon i said:v casing being,

purpose olf'com'pensating for the. increased of rotation I of either, driven shaft wh ch are directly connected tov the driving wheels)v inthe travel of thevehicle ina curvilinear path.

The differential mechanism comprises the usual arrangement of beveledgears mounted upon the driven shafts 3- 3, the beveled )inions connecting these beveled gearsyand carried by the rotative sleeve 5, journaled within thecasin'g by means of suitable'antifriction bearings; In other words, the differential mechanism is interposed between vthe driven shafts 3&3,

latter member is in drivingdriving shaft 2 the: eccentric gear drive herein? and the, r'otative sleeve'5, which engagement with theafter to be described in detail.

The driving shaft or member 2, consists of .a' tubular member surrounding the driven shaft "8 extending from the right and is positively" casing,

connected or coupled with the motor or other source of power through the medium of a coupling member 6 mounted at its outer end. Surrounding the shaft 2 is a tubular sleeve I permanently keyed theretoby means of a key 8. The driving shaft and the sleeve/Z are journaled-in ball bearand" 9 which engage the extreme end length of; the

and the outer bearing portions of the sleeve 7, the inner bearing being carried also by the rotative sleeve fi radial groove surrounding the outer end of'the drivin from the en s'of the sleeve 7 are formed integral and eccentrically disposed bearing members 1111, the same being spaced apart from each other bya space forming the central portion of the sleeve'7. These eccentric bearin members, as before suggested, are forms integral with the sleeves, and provide annular bearing surfaces having their centers offset from the axis, of rotation of the shaft 2, andsits sleeve 7 The eccentricbearing members 11-11 are 'identical as regards their annular relation'to' the sleeve 7 Intermediate the eccentric bearing mem "bers 1111 an "out substantial extending radially throughy one-half. of the circumference of the sleeve 7, is'a counter-weight 12,

preferably formed or cast integrally with said sleeve 7. This counter weight'is pref'- erably a mass ofmetal of predetermined weight, as will hereinafter appear, and having a semi-circular shape, and distributed throughout-that portion of the shaft opposed to the portions of maximum offset or eccentricity of said bearing'members 11-11.

ounted upon the sleeve 2 and directly upon the eccentric bearing members. 11l1 thereof, isaIgearmember 13,,the same comprising a toothed body portion 14, and an integral ring 15 offset laterally from-the bodyjmember 14, and lying in the plane of" the right hand eccentric bearing member '11 Interposed between thering 15 and the adjacent eccentric bearing member. 11 is a ball bearing 16 of the ordinary construction;-

The body portion or gear wheel'proper 14 is more directly supported by means'of a similar ball-bearing the" internal annular I ing the gear wheel I 1 wheel 18, the same being slightly greater in f diameter than, the gearwheel 14, and having say, one more tooth than upon the rota'tive 1 a plurality of rivets 17 interposed between surface of the gear wheel and the other or innermost eccentric bearing member 11. v

' 14 is an internal gear said gear wheel 14. Thegear wheel 18 is rigidlyinounted has flange '19 integral with and which "has abutting dium of a radial the gear wheel 18,

, {.relatiQnwith'a radial flange 20 formedat the inner end of said rotative sleeve 5, and or other fastening'mem bers 21,-extending through said flanges. A

large encircling roller bearing22' surrounds the gear wheel 18 and serves to antifrictionally mount. the samewithin the. casing, the

rollers 23 thereof engaging the outer annular surface'of the gear wheel 18, and the inner annular surface of the sleeve 24 which forms 'a lining for the casing throughout shaft 2-. Immediately inward .t1

7 details connecting Immediately surroundsleeve 5 through theme-V ther described at thistime.

the I portion '7 thereof surrounding the gear Wheels and parts associated therewith ,9 being mounted in a V The eccentric or gyrating gear wheel 18 comprises other parts designed to support 1e same in its movement, as follows: I Intermediate the gear wheel proper and the ring 15 thereof are pivotally connected links 25 through means ofthis arrangementlof links: the, eccentrically rotative gear member 13 is supported in its motion, as will be from the following description of the movements of the several parts of the mechanism described.

- Assuming that the'driving shaft is positively rotated by means of prime mover, it ismanifestthat the sleeve *7 will rotate with the drivingshaft atthe my copending application here-.

understood a. motor or other the medium of radial lug I 26, and diametrically opposed to said links same speed. The eccentric gear member 13 being journaled or rotatively-mountedupon the eccentric bearing members 11, 11 integral with the sleeve 7,

an eccentric gyra I 'tory movement is imparted to said. gear member 13, thismovement being more in the-nature of a rolling movement in contact with and around the internal gear wheel 18,]the latter being rotated in the same direction as the driving shaft 2, but

at a reduced speed which I may be expressed as inversely proportional to the number of Wheel 18 is V rotative sleeve 5, and thence to' the driven shafts 3'3 through the intermedi'atedilfer- The principle of'this type entia l gearing.

teeth of theigear ;whe'els14 and 18 'The rotative movement imparted to the gearmanifestlv transmitted to the of. speed reducinggearing is fully described 7 and illustrated 1n a prior application filed by me for vehicle drivemechanism on the 22ndday of March, 1917 and bearing Serial No. 156,621,:1nd therefore need Referring now to the function jof the counter-weight 12, it is to be observedthat this-member rotates'with the driving shaft 2, its path-of rotation being immediately adjacent'to the said shaft, and is included within and surrounded by the eccentric gear wheel 14. In other words, the extreme diameter of the annular space swept-through by the counter-weight in itsrotative' movement, is considerably less than the diameter of the eccentric, gear wheel 14, in fact, it is not be fursubstantially of the same diameter as the ball bearings supporting said gear wheel. The counter-weight 12, as before suggested, is so constructed that its center of gravity must necessarily be offset from the axis of rotation of the driving shaft 2. It necessarily follows also that the center of gravity of the eccentric gear member 13 must also be offset from the axis of rotation of the driving shaft. Thus, by designing the counter-weight 12 so that its weight substantially counter-balances the unstable mass of the eccentric gear member 13, and by locating its center of gravity diametrically opposite the true center of gravity of the eccentric gear member, a condition of equilibrium is established which has the effect of overcoming the unstable or unequal distribution of the mass of the rotating parts to the end that all of the parts may rotate at high speed without the attending action that would ordinarily take place in the absence of the counter-balancing element, these effects of unstability being ordinarily vibrations created throughout the mechanism, excessive and unequal wear between the parts, as well as other tendencies which develop in magnitude as the speed is increased. utilizing the particular type of speed reducing mechanism herein described, in connection with motor vehicle transmission, that its practicability must necessarily de pend upon the smooth action between the power transmitting members, this action being highly desirable under condition of high speeds that is ordinarily present in motor vehicle transmissions. This counter balancing feature has as a further advantage, its location in close proximity to its axis of rotation, and its inclosure within the eccentric gear member with which it cooperates. For this reason it occupies very little space in the mechanism, and its full advantages may be secured without sacrific ing any degree of compactness in the com-.

plete mechanism of which it forms a part. The types of mechanism in which this particular arrangement of elements may find its use, may obviously be numerous, and therefore I do not wish to be limited to the particular type of gearing herein illustrated and described, except in so far as it It is manifest therefore that in is specifically set forth in the appended claims.

I claim as my invention:

1. In a mechanical movement, the combination of a shaft comprising longitudinally spaced bearing surfaces disposed eccentrically to the axis of rotation of the shaft, a gear wheel rotatively mounted on said eccentric bearing surfaces, and a counterweight fixed to said shaft intermediate said bearing surfaces.

2. In a mechanical movement, the combination of a shaft comprising longitudinally spaced bearing surfaces disposed eccentrically to the axis of said shaft, anti-friction bearings mounted on said bearing surfaces, a gear wheel mounted on said anti-friction bearings, and a counterweight fixed to said shaft intermediatesaid bearing surfaces.

3. In a mechanical movement, the combination of a shaft, a sleeve fixed to said shaft and comprising radial bearing surfaces spaced apart longitudinally and disposed eccentrically to the axis of said sieeve, a coun-.

terweight located therebetween, and a gear wheel mounted on said sleeve and having bearing on said bearing surfaces.

4. In a mechanical movement, the combination of a shaft, a sleeve fixed to said shaft, and comprising longitudinally spaced radial bearing surfaces disposed eccentrically to the axis of rotation of the shaft, a gear wheel rotatively mounted on said eccentric hearing surface,,and a counter-weight integral with said sleeve, and located between said bearing surfaces and lying substantially in the same plane with said gear wheel.

5. In a mechanical movement, the combination of driving and driven shafts, a sleeve fixed to said driving shaft and provided with bearing surfaces, a gear wheel rotatively mounted on said sleeve and engaging said eccentric bearing surface, an internal gear wheel concentrically mounted on said driven shaft, and a counter-weight integral with said sleeve and located adjacentto said eccentric bearing surfaces, and having its mass distributed circumferentially about the axis of said sleeve.

' In witness whereof, I hereunto subscribe my name this 22nd'day of April, A. 1)., 1920.

JOHN xRoHN; V 

